# __author__ = "James Zhang"
# !/usr/bin/python
# -*- coding: utf-8 -*-


class SuspiciousOperation(Exception):
    """The user did something suspicious"""


class InvalidSessionKey(SuspiciousOperation):
    """Invalid characters in session key"""
    pass


class SuspiciousSession(SuspiciousOperation):
    """The session may be tampered with"""
    pass
